# -*- coding: utf-8 -*-
class UrlManager(object):
    #添加一个URL
    def __init__(self):
        self.new_urls=set()
        self.old_urls=set()
    def add_new_url(self,url):
        if url is None:
            return
        if url not in self.new_urls and url not in self.old_urls:
            self.new_urls.add(url)

    def add_new_urls(self,urls):
        if urls is None or len(urls)==0:
            return
        for url in  urls:
            self.add_new_url(url)

    #获取一个URL
    def get_new_url(self):
        new_url=self.new_urls.pop()
        self.old_urls.add(new_url)
        return  new_url
    #判断是否有新的url
    def has_new_url(self):
        return  len(self.new_urls)!=0

